JP2022047039A - Lubricating oil supply device and rotation test device including the same - Google Patents

Abstract

To provide a technology which can avoid a bearing from being damaged due to inertia rotation of a shaft in the case where power supply is stopped due to power outage and the like.SOLUTION: A lubricating oil supply device 6 which supplies a lubricating oil to a bearing includes: a supply part 61 for supplying a lubricating oil stored in a temporary storage part 611 which stores the lubricating oil temporarily to a bearing little by little together with compressed air; a lubricating oil supply passage 621 which is connected to the temporary storage part 611 at one end, and which is connected to a lubricating oil storage part 620 for storing the lubricating oil at the other end; a delivery part 622 which is provided at the lubricating oil supply passage 621, and which delivers the lubricating oil stored in the lubricating oil storage part 620 via the lubricating oil supply passage 621 and fills it in the temporary storage part 611; an air supply passage 631 which is connected to the supply part 61 at one end, and which is connected to a compressed air supply part 630 for supplying compressed air at the other end; and a pressure accumulation part 633 which is provided at the air supply passage 631, and for accumulating the compressed air.SELECTED DRAWING: Figure 3

Description

The present invention relates to a lubricating oil supply device that supplies lubricating oil to bearings, and a rotation test device including the lubricating oil supply device.

A rotation test device for performing a rotation test of a specimen such as a motor is known. As shown in Patent Document 1, for example, the rotation test apparatus includes a rotating body such as a dynamo and a shaft (intermediate shaft) for connecting the rotating body to the test body. Then, the rotating body rotates these while applying a test load (pseudo load or pseudo driving force) to the specimen, and the torque value generated between the rotating body and the specimen at that time. Is measured with a torque meter provided on the intermediate shaft. Then, based on the measured torque value, the torque value generated by the specimen is specified.

All devices with a rotating shaft, including such rotation test devices, are provided with bearings to rotatably support the shaft.

The bearing is provided with a configuration for lubricating the bearing in order to reduce friction and wear inside the bearing and prevent seizure. As a method for lubricating a bearing, a method using grease as a lubricant (grease lubrication) and a method using oil as a lubricant (oil lubrication) are known. In general, oil lubrication is preferable when the shaft is rotated at high speed or when the bearing needs to be cooled. For example, Patent Document 1 describes that a bearing supporting an intermediate shaft of a rotation test device is lubricated by oil lubrication.

There are various methods for supplying oil (lubricating oil) to bearings, even if it is called oil lubrication (for example, Patent Document 2). For example, a method in which the lubricating oil stored in the tank is sucked up by a pump and sent to a nozzle, and the lubricating oil is injected from the nozzle at a predetermined pressure (oil jet lubrication). There are known methods (oil mist lubrication), compressed air and lubricating oil mixed with a mixing valve, etc. and supplied as an oil-air state (oil-air lubrication), which are appropriate according to the usage conditions of the bearing. The method is selected.

Japanese Unexamined Patent Publication No. 2019-28041 Japanese Patent No. 3924980

For example, in the case of a rotation test device, in order to accurately identify the torque value generated by the specimen based on the torque value measured by the torque meter provided on the intermediate shaft, the fluctuation (variation) of the torque loss that occurs on the intermediate shaft is required. Should be kept as small as possible. However, when the lubricating oil is supplied to the bearing provided on the intermediate shaft by oil jet lubrication, the pulsation of the pump that sucks the lubricating oil from the tank in which the lubricating oil is stored and sends it to the nozzle directly reaches the bearing. This causes the torque loss on the intermediate shaft to fluctuate. Therefore, as a method of supplying lubricating oil to the bearing provided on the intermediate shaft, oil mist lubrication or oil air lubrication, which is not affected by the pulsation of the pump, is preferable.

Further, since the torque loss on the intermediate shaft varies depending on the viscosity of the lubricating oil supplied to the bearing, it is preferable that the amount of the lubricating oil supplied to the bearing is small in order to suppress the fluctuation range. In this respect, oil lumist lubrication and oil air lubrication can suppress the amount of lubricating oil supplied to the bearing to a significantly smaller amount than oil jet lubrication (for example, in oil mist lubrication, the bearing can be supplied per unit time. The amount of lubricating oil supplied is about 1/10 of that of oil jet lubrication, and the amount of lubricating oil supplied to the bearings per unit time in oil-air lubrication is 100 minutes of that of oil jet lubrication. Only about 1). From this point of view, oil mist lubrication and oil air lubrication are preferable as the supply mode of the lubricating oil to the bearing provided on the intermediate shaft, and oil air lubrication is particularly preferable.

By the way, for example, due to a sudden power failure, the power supply to the device may be stopped unexpectedly. In any device having a rotating shaft, including a rotation test device, the shaft continues to rotate due to inertial rotation for some time after the power supply to the device is stopped. The duration of inertial rotation becomes longer as the number of rotations of the shaft increases and as the moment of inertia of the shaft increases.

However, in the event of a power outage or the like, the supply of electric power to the mechanism for supplying lubricating oil to the bearings is also stopped. For example, when the lubricating oil is supplied by oil jet lubrication, the supply of power to the pump that sucks up the lubricating oil from the tank or the like that stores the lubricating oil and sends it to the nozzle is stopped. Further, for example, when the lubricating oil is supplied by oil mist lubrication or oil air lubrication, the supply of electric power to the air compressor that supplies compressed air for generating oil mist or oil air is stopped. In either case, the supply of lubricating oil to the bearing is stopped. That is, when a power failure occurs, the shaft continues to rotate due to inertial rotation without supplying lubricating oil to the bearing for a while.

In the case of oil jet lubrication, the amount of lubricating oil supplied to the bearing per unit time is relatively large. Therefore, a certain amount of lubricating oil is always held in the bearing. Therefore, even if the power supply is stopped due to a power failure or the like and the supply of the lubricating oil to the bearing is stopped at the same time, it is unlikely that the lubricating oil will be exhausted until the inertial rotation of the shaft is stopped. ..

On the other hand, in the case of oil mist lubrication or oil air lubrication, the amount of lubricating oil supplied to the bearing per unit time is very small. Therefore, if the power supply is stopped due to a power failure or the like and the supply of the lubricating oil to the bearing is stopped at the same time, the lubricating oil may be exhausted before the inertial rotation of the shaft is stopped, and the bearing may be damaged. There is.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a technique capable of avoiding damage to a bearing due to inertial rotation of a shaft when the power supply is stopped due to a power failure or the like. ..

The present invention has taken the following measures in order to achieve the above object.

That is, the present invention is a lubricating oil supply device that supplies lubricating oil to bearings, and includes a temporary storage unit that temporarily stores the lubricating oil, and the lubricating oil stored in the temporary storage unit is compressed air little by little. Provided in the lubricating oil supply path and the lubricating oil supply path, which are connected to the temporary storage section at one end and connected to the lubricating oil storage section for storing the lubricating oil at the other end. A delivery section that sends out the lubricating oil stored in the lubricating oil storage section via the lubricating oil supply path to fill the temporary storage section, and is connected to the supply section at one end and at the other end. It is characterized by including an air supply path connected to a compressed air supply section for supplying compressed air, and a pressure accumulator section for storing compressed air provided in the air supply path.

According to this configuration, when the supply of compressed air from the compressed air supply unit is stopped due to the power supply being stopped due to a power failure or the like, the compressed air stored in the accumulator unit is supplied to the supply unit. Then, the supply of compressed air to the supply unit is maintained. Therefore, in the supply section, the lubricating oil stored in the temporary storage section can be continuously supplied to the bearing little by little together with the compressed air supplied from the accumulator section. That is, even if the supply of electric power is stopped, the supply of the lubricating oil to the bearing is not immediately stopped, and the supply of the lubricating oil to the bearing can be maintained for a while. This makes it possible to prevent the bearing from being damaged by the inertial rotation of the shaft.

In particular, according to the above configuration, since the accumulator is provided in the air supply path, when the supply of compressed air from the compressed air supply section is stopped and the internal pressure of the air supply path drops, the internal pressure of the accumulator section becomes air. The pressure is relatively higher than the internal pressure of the supply path, and the compressed air stored in the accumulator section is naturally sent to the supply section via the air supply path. Therefore, it is not necessary to provide a configuration for switching the supply source of the compressed air to the supply unit between the compressed air supply unit and the pressure accumulator unit. Further, since the accumulator is provided in the air supply path, when the supply of the compressed air from the compressed air supply unit is resumed, the compressed air supplied from the accumulator is stored in the accumulator. Therefore, it is not necessary to separately provide a configuration for replenishing the compressed air in the accumulator. As described above, according to the above configuration, the device configuration can be simplified.

In the lubricating oil supply device, it is preferable that the supply unit generates oil air.

Alternatively, in the lubricating oil supply device, it is preferable that the supply unit generates oil mist.

According to these configurations, the amount of lubricating oil supplied to the bearing can be suppressed. On the other hand, the smaller the amount of lubricating oil supplied, the higher the risk that the lubricating oil will be exhausted and the bearings will be damaged when the power supply is stopped due to a power failure or the like until the inertial rotation of the shaft is stopped. However, here, since the supply of the lubricating oil to the bearing can be continued for a while after the power supply is stopped, such a situation can be avoided in advance.

Further, the lubricating oil supply device includes a solenoid valve provided between the accumulator section and the supply section in the middle of the air supply path, and the solenoid valve is stopped from supplying electric power. Occasionally, it is also preferred that it is configured to maintain the state immediately preceding it.

For example, when the shaft supported by the bearing is rotating, the electromagnetic valve is opened and the lubricating oil supply unit supplies the lubricating oil to the bearing. If the power supply is stopped due to a power failure or the like while in the state, the electromagnetic valve is kept in the open state. Therefore, the supply of compressed air from the accumulator to the supply section is not obstructed by the solenoid valve. On the other hand, when the shaft is not rotating, the solenoid valve is closed and the lubricating oil supply unit does not supply the lubricating oil to the bearing. However, in such a state, power is supplied due to a power failure or the like. When stopped, the solenoid valve remains closed. Therefore, there is no possibility that the supply of the lubricating oil to the bearing is started even though the shaft is not rotating.

Further, the lubricating oil supply device according to each of the above configurations is a rotation test device for performing a rotation test of the specimen, and is a rotating body, an intermediate shaft connecting the specimen and the rotating body, and the intermediate shaft. It is preferable to apply it to a rotation test apparatus including a bearing that rotatably supports the body and a torque detection unit that detects a torque generated between the specimen and the rotating body.

According to the present invention, it is possible to prevent the bearing from being damaged by the inertial rotation of the shaft when the power supply is stopped due to a power failure or the like.

The figure which shows the schematic structure of the rotation test apparatus which concerns on embodiment. The figure which shows the schematic structure of the part housed in a bearing housing in an intermediate shaft. The block diagram which shows the structure of the lubricating oil supply part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1. Overall configuration of rotation test equipment>
The configuration of the rotation test apparatus 100 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a schematic configuration of a rotation test device 100. FIG. 2 is a diagram showing a schematic configuration of a portion of the intermediate shaft 3 housed in the bearing housing 12, and the bearing housing 12 is shown in a cross-sectional state.

The rotation test device 100 is a test device for rotating the test piece 9 to obtain various measurement data of the test piece 9. A control device 90 for driving and controlling the test piece 9 is connected to the test piece 9, and the control device 90 supplies electric power according to a torque command input from the outside to the test piece 9 to control the torque. It is configured to do. As the specimen 9, for example, a motor or a transmission for a vehicle is assumed, and in this case, the rotation test device 100 constitutes a vehicle test device.

The rotation test device 100 is provided on a base 1, a rotating body, a dynamo 2, an intermediate shaft 3 which is a rotating shaft connecting the dynamo 2 and the specimen 9, and a dynamo 2 and a specimen 9 provided on the intermediate shaft 3. It is provided with a torque meter 4 which is a torque detecting unit for detecting the torque generated between the two. Further, the rotation test device 100 includes a pair of bearings (intermediate bearings) 5 and 5 that rotatably support the intermediate shaft 3, and a lubricating oil supply unit 6 that supplies lubricating oil to each bearing 5. Further, the rotation test device 100 includes a control unit 7 that controls each unit included in the rotation test device 100.

The dynamo 2 is a rotating body for applying a test load (for example, a pseudo load, a pseudo driving force) to the specimen 9, and is composed of an electric motor whose rotation speed can be controlled. Further, the dynamo 2 is provided with a rotation speed sensor 21 for detecting the rotation speed.

The intermediate shaft 3 is a rotation shaft that connects the dynamo 2 and the specimen 9. That is, the intermediate shaft 3 is connected to the dynamo 2 (specifically, its rotor) arranged on one end side of the base 1 at one end, and is provided on the other end side of the base 1 at the other end. The dynamo 2 and the specimen 9 are connected by being connected to the specimen 9 (specifically, its rotation axis) fixed to the fixed wall 11. The connection between the rotor of the dynamo 2 (or the rotating shaft of the specimen 9) and the intermediate shaft 3 is made, for example, by fastening the couplings provided on both of them with bolts. The intermediate shaft 3 is provided so as to penetrate the bearing housing 12 supported on the base 1 via the support column 13 in the axial direction, and the pair of bearings 5 and 5 supported in the bearing housing 12 (FIG. 5). It is rotatably supported by 2).

The torque meter 4 is a torque detection unit that detects the torque generated between the dynamo 2 and the specimen 9, and is provided in the middle of the extension of the intermediate shaft 3. Specifically, for example, the torque meter 4 detects the difference in the helix angle generated in the intermediate shaft 3, obtains the torque generated in the intermediate shaft 3 from the detected difference in the helix angle, and uses this as a torque signal in the control unit 7. Output to. However, the process of calculating the torque generated in the intermediate shaft 3 from the difference in the helix angle may be performed by the control unit 7 instead of the torque meter 4. In this case, the torque detection unit is realized by the cooperation of the torque meter 4 and the control unit 7. The control unit 7 identifies the torque value generated by the specimen 9 based on the torque signal (or the signal corresponding to the difference in the helix angle) acquired from the torque meter 4.

The bearing 5 is a member for rotatably supporting the intermediate shaft 3 and is supported inside the cylindrical bearing housing 12. Specifically, inside the bearing housing 12, bearing support portions 121 are provided near each end in the axial direction, and the bearing 5 is supported by each bearing support portion 121. The intermediate shaft 3 is provided so as to penetrate the bearing housing 12 in the axial direction at a portion between the end portion on the side connected to the specimen 9 and the position where the torque meter 4 is provided. The intermediate shaft 3 is rotatably supported by the bearing 5 at two axially separated portions in the portion penetrating the bearing housing 12.

The bearing 5 arranged on the side of the dynamo 2 and the bearing 5 arranged on the side of the specimen 9 have the same structure. That is, each bearing 5 is sandwiched between the inner ring 51 fitted to the outer peripheral surface of the intermediate shaft 3, the outer ring 52 fixed to the bearing support portion 121, and the inner ring 51 and the outer ring 52. It is composed of a plurality of rolling elements 53 that roll in a state and a rolling bearing (in the example of the figure, a deep groove ball bearing). In such a configuration, the intermediate shaft 3 is rotatably supported by rolling the rolling element 53 of each bearing 5.

The lubricating oil supply unit 6 is a device (lubricating oil supply device) for supplying lubricating oil to each bearing 5. As shown schematically in FIG. 2, the lubricating oil supply unit 6 has a first supply path portion 601 connected to the bearing housing 12 and a second supply path portion 602 penetrating the bearing housing 12. It is configured so that lubricating oil can be supplied to each bearing 5 via the above. The supply direction of the lubricating oil to each bearing 5 is the direction from the end side in the axial direction of the bearing housing 12 toward the center side. Although not shown in the figure, the intermediate shaft 3 has a shape in which the diameter is slightly reduced toward the center side in the axial direction of the bearing housing 12, whereby the lubrication supplied from one end side of each bearing 5 is supplied. The oil flows toward the other end side.

Although not shown, excess lubricating oil supplied to each bearing 5 is supplied to the discharge path (for example, the first discharge path portion penetrating the bearing housing 12 and the outside of the bearing housing 12). It is discharged to the outside through a discharge path (consisting of a discharge path including the arranged second discharge portion), and is collected or the like.

<2. Configuration of lubricating oil supply unit>
The configuration of the lubricating oil supply unit 6 will be described with reference to FIG. 3 in addition to FIGS. 1 and 2. FIG. 3 is a block diagram showing a schematic configuration of the lubricating oil supply unit 6.

The lubricating oil supply unit 6 supplies the lubricating oil to the bearing 5, the lubricating oil supply unit 62 for supplying the lubricating oil to the supply unit 61, and the compressed air to the supply unit 61. An air supply unit 63 for the purpose is provided. Further, the lubricating oil supply unit 6 includes a control unit 64 that controls each unit provided therein. A part or all of the functions of the control unit 64 may be realized by the control unit 7 of the rotation test apparatus 100.

(Lubricating oil supply unit 62)
The lubricating oil supply unit 62 includes a lubricating oil supply path 621 and a pump 622 provided in the lubricating oil supply path 621.

The lubricating oil supply path 621 is, for example, a pipe, and is connected to a supply unit 61 (specifically, a temporary storage unit 611 included in the supply unit 61) at one end and a lubricating oil storage at the other end. It is connected to the part (oil tank) 620.

The pump 622 sends out the lubricating oil stored in the lubricating oil storage unit 620 via the lubricating oil supply path 621 and fills the temporary storage unit 611 included in the supply unit 61. The pump 622 sucks up a preset amount of lubricating oil from the lubricating oil storage unit 620 and sends it out in one delivery operation (suction operation), and sends it out at preset intervals (for example, 1 in 4 minutes). Times), it is controlled to perform this sending operation.

(Air supply unit 63)
The air supply unit 63 is an accumulator provided in the middle of the air supply path 631, the solenoid valve 632 inserted in the middle of the air supply path 631, and the air supply path 631 on the upstream side of the solenoid valve 632. A unit 633 is provided.

The air supply path 631 is, for example, a pipe, which is connected to the supply unit 61 at one end and is connected to an air compressor (air compressor) 630 which is a compressed air supply unit for supplying compressed air at the other end. As the air compressor 630, for example, an air compressor provided as factory equipment is used. Such an air compressor 630 is connected not only to the air supply path 631 but also to pipes connected to various devices installed in the factory, and normally compresses various devices. Supplying air.

The solenoid valve 632 switches between an open state and a closed state in response to an electrical control signal from the control unit 64, and when the solenoid valve 632 is in the open state, it is pumped from the air compressor 630. Compressed air is supplied to the supply unit 61 through the air supply path 631. When the solenoid valve 632 is closed, the supply of compressed air from the air compressor 630 to the supply unit 61 is stopped. However, the solenoid valve 632 is configured to maintain the state immediately before the power supply is stopped due to a power failure or the like. That is, when the solenoid valve 632 is in the open state and the power supply is stopped due to a power failure or the like, the solenoid valve 632 is maintained in the open state even after the power supply is stopped, and the power failure occurs when the electromagnetic valve 632 is in the closed state. When the power supply is stopped due to such reasons, it is configured to be maintained in the closed state even after the power supply is stopped.

The pressure accumulator unit 633 is a container (air tank) for storing compressed air. The pressure accumulator unit 633 is provided in the middle of the air supply path 631 and stores the compressed air supplied from the air compressor 630. When the supply of electric power to the air compressor 630 is stopped due to a power failure or the like and the supply of compressed air from this is stopped, the internal pressure of the air supply path 631 decreases, and the internal pressure of the accumulator section 633 becomes the internal pressure of the air supply path 631. Relatively higher than. As a result, the compressed air stored in the accumulator unit 633 is naturally sent to the supply unit 61 via the air supply path 631. After that, when the supply of the compressed air from the air compressor 630 is restarted, the compressed air supplied from the air compressor 630 is stored in the accumulator unit 633 due to the reverse pressure difference.

(Supply unit 61)
The supply unit 61 includes a temporary storage unit 611 for temporarily storing the lubricating oil supplied from the lubricating oil supply unit 62. The temporary storage unit 611 is a container (for example, a dish-shaped container) capable of storing at least the lubricating oil delivered by one delivery operation of the pump 622, and lubricates each time the pump 622 performs one delivery operation. The entire amount of the lubricating oil sent out at one time through the oil supply path 621 is temporarily stored in the temporary storage unit 611.

The supply unit 61 supplies the lubricating oil stored in the temporary storage unit 611 to the bearing 5 in small amounts (predetermined amount) together with compressed air. In this embodiment, the supply unit 61 is configured to include an oil air generator. In this case, in the supply unit 61, the lubricating oil stored in the temporary storage unit 611 is intermittently discharged by a piston or the like in a predetermined minute amount, and the discharged minute amount of the lubricating oil is compressed air by a mixing valve or the like. Oil air is continuously generated by being derived into the air and being mixed with compressed air one after another. The generated oil air is sequentially sent to the first supply path portion 601 and the second supply path portion 602 by the compressed air supplied from the air supply unit 63, and is supplied to each bearing 5.

However, the amount of lubricating oil delivered by one delivery operation of the pump 622 is the amount of the lubricating oil mixed with the compressed air per unit time in the supply unit 61 and the interval at which the pump 622 performs the delivery operation. It is set based on the above, and it is guaranteed that the lubricating oil stored in the temporary storage unit 611 is not exhausted during the delivery operation interval of the pump 622. For example, when the supply unit 61 includes an oil air generator that generates oil air, the amount of lubricating oil mixed with the compressed air in the supply unit 61 per unit time is about 0.002 ml / min. In this case, assuming that the pump 622 performs a delivery operation once every 4 minutes, the amount of lubricating oil delivered by one delivery operation of the pump 622 is set to 0.008 ml or more.

<3. Operation of lubricating oil supply unit>
The lubricating oil supply unit 6 supplies lubricating oil to the bearing 5 provided on the intermediate shaft 3 while the rotation test device 100 is being operated. The operation of the lubricating oil supply unit 6 will be described with reference to FIGS. 1 to 3.

In a normal state (during power supply) in which electric power is supplied, the pump 622 performs a transmission operation at preset intervals. Each time the pump 622 performs one delivery operation, a preset amount of lubricating oil is sucked up from the lubricating oil storage section 620, sent out through the lubricating oil supply path 621, and filled in the temporary storage section 611. do.

On the other hand, in a normal state where power is supplied, compressed air is pumped from the air compressor 630 to the air supply path 631, and the electromagnetic valve 632 responds to the control signal sent from the control unit 64. When the closed state is switched to the open state, the compressed air supplied from the air compressor 630 is started to be supplied to the supply unit 61 via the air supply path 631.

In the supply unit 61, the lubricating oil stored in the temporary storage unit 611 is mixed with the compressed air supplied from the air supply path 631 in small amounts (predetermined amount) to generate oil air, which is the first. It is derived to the supply path portion 601. The derived oil air is supplied to each bearing 5 through the first supply path portion 601 and the second supply path portion 602. As a result, each bearing 5 supporting the rotating intermediate shaft 3 is lubricated.

It is assumed that the power supply is stopped due to a power failure or the like while such an operation is being performed. However, here, it is assumed that not only the power supply to the rotation test device 100 is stopped, but also the power supply to the entire factory equipment in which the rotation test device 100 is installed is stopped as a whole. ing. That is, when an air compressor provided as factory equipment is used as the air compressor 630, it is assumed that even the supply of electric power to the air compressor is stopped.

Even if the power supply is stopped, the intermediate shaft 3 of the rotation test device 100 continues to rotate due to inertial rotation for a while (for example, for a few minutes).

On the other hand, when the power supply is stopped, the operation of the pump 622 is stopped. Therefore, the temporary storage portion 611 is not filled with new lubricating oil. However, as described above, the pump 622 should deliver a certain amount of lubricating oil (that is, more than the total amount of lubricating oil consumed during the delivery operation interval) in one delivery operation. It has been set. Further, after the temporary storage portion 611 is filled with the lubricating oil for the first time, the solenoid valve 632 is usually switched from the closed state to the open state (that is, the generation of oil air is started) with a slight time lag. In consideration of the above, the amount of lubricating oil held in the temporary storage unit 611 does not become zero even at the timing immediately before the pump 622 performs the delivery operation. That is, no matter when the operation of the pump 622 is stopped, the temporary storage unit 611 contains a sufficiently large amount of lubricating oil compared to the amount of lubricating oil mixed with the compressed air per unit time in the supply unit 61. , Is held.

Further, when the supply of electric power is stopped, the operation of the air compressor 630 is also stopped, and the supply of compressed air from the air compressor 630 is also stopped. Then, since the internal pressure of the air supply path 631 decreases, the internal pressure of the accumulator section 633 becomes higher than the internal pressure of the air supply path 631, and the compressed air stored in the accumulator section 633 naturally passes through the air supply path 631. It is sent to the supply unit 61. A solenoid valve 632 is provided on the downstream side of the accumulator portion 633, and the solenoid valve 632 is configured to maintain the state immediately before the power supply is stopped due to a power failure or the like. ing. Here, since the solenoid valve 632 is in the open state immediately before the power supply is stopped, the solenoid valve 632 is maintained in the open state even after the power supply is stopped due to a power failure or the like. Therefore, the delivery of compressed air from the accumulator unit 633 to the supply unit 61 is not hindered by the solenoid valve 632.

In this way, even after the power supply is stopped, the supply of the compressed air to the supply unit 61 is continued, so that the supply unit 61 can continue the same operation as when the power is supplied. That is, in the supply unit 61, the lubricating oil stored in the temporary storage unit 611 is mixed with the compressed air supplied from the air supply path 631 little by little to generate oil air, which is the first supply path. Derived to part 601. The derived oil air is supplied to each bearing 5 through the first supply path portion 601 and the second supply path portion 602. As a result, each bearing 5 supporting the intermediate shaft 3 that rotates inertially is lubricated.

When the power supply is restarted, such as when the power failure is restored, the supply of compressed air from the air compressor 630 is restarted. Then, the internal pressure of the air supply path 631 becomes higher than the internal pressure of the accumulator section 633 due to the compressed air pumped from the air compressor 630, and the compressed air supplied from the air compressor 630 is stored in the accumulator section 633. .. In this way, the accumulator unit 633 is immediately restored to the accumulator state after the power supply is resumed. Needless to say, the accumulator unit 633 is maintained in the accumulator state while the compressed air supplied from the air compressor 630 is supplied to the supply unit 61 via the air supply path 631.

<4. Effect>
The lubricating oil supply unit (lubricating oil supply device) 6 included in the rotation test device 100 according to the above embodiment includes a temporary storage unit 611 for temporarily storing the lubricating oil, and the lubricating oil stored in the temporary storage unit 611. Lubricating oil supply path 621 connected to a temporary storage unit 611 at one end and a lubricating oil storage unit 620 for storing lubricating oil at the other end, and a supply unit 61 that supplies compressed air little by little to the bearing 5. The pump 622, which is provided in the lubricating oil supply path 621 and is a delivery section that sends out the lubricating oil stored in the lubricating oil storage section 620 via the lubricating oil supply path 621 and fills the temporary storage section 611. Compressed air provided in an air supply path 631 and an air supply path 631 connected to a supply section 61 at one end and connected to an air compressor 630 which is a compressed air supply section for supplying compressed air at the other end. It is provided with a pressure accumulating unit 633 and a pressure accumulating unit 633.

According to this configuration, when the supply of compressed air from the air compressor 630 is stopped due to the power supply being stopped due to a power failure or the like, the compressed air stored in the accumulator 633 is supplied to the supply unit 61. As a result, the supply of compressed air to the supply unit 61 is maintained. Therefore, the supply unit 61 can continue to supply the lubricating oil stored in the temporary storage unit 611 to the bearing 5 little by little together with the compressed air supplied from the pressure accumulator unit 633. That is, even if the supply of electric power is stopped, the supply of the lubricating oil to the bearing 5 is not immediately stopped, and the supply of the lubricating oil to the bearing 5 can be continued for a while. As a result, it is possible to prevent the bearing 5 from being damaged by the inertial rotation of the intermediate shaft 3.

In particular, according to the above configuration, since the accumulator section 633 is provided in the air supply path 631, when the supply of compressed air from the air compressor 630 is stopped and the internal pressure of the air supply path 631 drops, the accumulator section 633 The internal pressure of the air supply path 631 becomes relatively higher than the internal pressure of the air supply path 631, and the compressed air stored in the accumulator section 633 is naturally sent to the supply section 61 via the air supply path 631. Therefore, it is not necessary to provide a configuration for switching the supply source of the compressed air to the supply unit 61 between the air compressor 630 and the accumulator unit 633. Further, since the accumulator section 633 is provided in the air supply path 631, when the supply of the compressed air from the air compressor 630 is restarted, the compressed air supplied from the accumulator section 633 is stored in the accumulator section 633. Therefore, it is not necessary to separately provide the accumulator 633 with a configuration for replenishing the compressed air. As described above, according to the above configuration, the device configuration can be simplified.

Further, in the lubricating oil supply unit 6 according to the above embodiment, the supply unit 61 generates oil air. According to this configuration, the amount of lubricating oil supplied to the bearing 5 can be suppressed to a particularly small amount. On the other hand, as the supply amount of the lubricating oil decreases, when the power supply is stopped due to a power failure or the like, the lubricating oil is exhausted and the bearing 5 is damaged until the inertial rotation of the intermediate shaft 3 is stopped. Although the risk increases, here, since the supply of the lubricating oil to the bearing 5 can be continued for a while after the power supply is stopped, such a situation can be avoided in advance.

Further, the lubricating oil supply unit 6 according to the above embodiment includes a solenoid valve 632 provided between the pressure accumulator unit 633 and the supply unit 61 in the middle of the air supply path 631, and the solenoid valve 632 has a solenoid valve 632. When the power supply is stopped, the state immediately before it is maintained. For example, when the intermediate shaft 3 is rotating, the solenoid valve 632 is opened and the lubricating oil supply unit 6 supplies the lubricating oil to the bearing 5. In this configuration, such a state is provided. If the power supply is stopped due to a power failure or the like, the solenoid valve 632 is maintained in the open state. Therefore, the supply of compressed air from the accumulator unit 633 to the supply unit 61 is not hindered by the solenoid valve 632. On the other hand, when the intermediate shaft 3 is not rotating, the solenoid valve 632 is closed and the lubricating oil supply unit 6 does not supply the lubricating oil to the bearing 5, but in such a state, a power failure or the like occurs. When the power supply is stopped by the solenoid valve 632, the solenoid valve 632 is kept in the closed state. Therefore, there is no possibility that the supply of the lubricating oil to the bearing 5 is started even though the intermediate shaft 3 is not rotating.

Further, in the lubricating oil supply unit 6 according to the above embodiment, the supply unit 61 supplies the lubricating oil stored in the temporary storage unit 611 to the bearing 5 little by little together with the compressed air. When the lubricating oil is supplied to the bearing 5 by, for example, oil jet lubrication, the torque loss at the intermediate shaft 3 fluctuates due to the pulsation of the pump that sucks the lubricating oil from the tank storing the lubricating oil and sends it to the nozzle. Although there is a risk, according to this lubricating oil supply unit 6, the lubricating oil sent out from the pump 622 is first temporarily stored in the temporary storage unit 611, and further supplied to the bearing 5 together with the compressed air, so that the pump There is no risk that the pulsation of 622 will fluctuate the torque loss at the intermediate shaft 3. By suppressing the fluctuation of the torque loss on the intermediate shaft 3, it is possible to accurately specify the torque value generated by the specimen 9.

Further, according to a mode in which the supply unit 61 supplies the lubricating oil stored in the temporary storage unit 611 to the bearing 5 little by little together with the compressed air, the lubricating oil supplied to the bearing 5 is compared with, for example, oil jet lubrication. The amount can be reduced. Therefore, it is possible to suppress fluctuations in torque loss on the intermediate shaft 3 due to the viscosity of the lubricating oil and the like. As a result, the torque value generated by the specimen 9 can be accurately specified.

<5. Other embodiments>
In the above embodiment, the supply unit 61 is supposed to generate oil air, but the supply unit may be one that generates oil mist. That is, the mode in which the lubricating oil is supplied to the bearing 5 together with the compressed air in small amounts (predetermined amount) is not limited to the one in which both are mixed to generate oil air and supplied to the bearing 5, and the compressed air is supplied. It may be used to mist the lubricating oil to generate oil mist and supply it to the bearing 5. Such a configuration can be realized, for example, by replacing the supply unit 61, which was configured to include the oil air generator in the above embodiment, with the oil mist generator. In this case, in the supply unit 61, the lubricating oil stored in the temporary storage unit 611 is supplied into the compressed air little by little, and the oil droplets of the lubricating oil are subdivided in the compressed air to form a mist. By becoming (mist-like), oil mist is generated. Then, the generated oil mist is mixed with the compressed air supplied from the air supply unit 63, and is sequentially sent to the first supply path portion 601 and the second supply path portion 602 by the compressed air to each bearing. It is supplied to 5. Even if the supply unit produces oil mist, the same effect as that of the above embodiment can be obtained.

Further, in the above embodiment, the structure of the bearing 5 may be any. For example, the bearing 5 may be a ball bearing in which the rolling element 53 is composed of balls as shown in FIG. 2, or may be a roller bearing in which the rolling element is composed of rollers.

Further, in the above embodiment, the accumulator unit 633 may be configured by an accumulator.

Further, in the above embodiment, the lubricating oil is supplied from the outer side in the axial direction of the bearing housing 12 toward the center side and flows toward the center side, but the supply direction of the lubricating oil is Not limited to this. For example, the lubricating oil may be supplied from the axial center of the bearing housing 12 toward the outside and flow toward the outside.

Further, in the above embodiment, a motor or a transmission for a vehicle has been exemplified as a specimen 9 to be tested by the rotation test apparatus 100, but the specimen 9 is not limited to these. That is, the present invention can be applied to various rotation test devices other than the vehicle test device.

Further, in the above embodiment, the case where the lubricating oil supply unit 6 is applied to the rotation test device 100 has been shown, but the lubricating oil supply unit 6 can be applied to an device other than the rotation test device 100. .. That is, the lubricating oil supply unit 6 is applicable to all devices having a bearing and adopting a method of supplying lubricating oil to the bearing together with compressed air (for example, oil mist lubrication or oil air lubrication) when lubricating the bearing. can do.

Other configurations can be variously modified without departing from the spirit of the present invention.

100 rotation test equipment 1 base 2 rotating body (dynamo)
3 Intermediate shaft 4 Torque detector (torque meter)
5 Bearing 6 Lubricating oil supply unit (lubricating oil supply device)
61 Supply section 611 Temporary storage section 62 Lubricating oil supply section 620 Lubricating oil storage section 621 Lubricating oil supply path 622 Delivery section (pump)
63 Air supply unit 630 Compressed air supply unit (air compressor)
631 Air supply path 632 Solenoid valve 633 Accumulation unit 64 Control unit 7 Control unit 9 Specimen (test motor)

Claims (5)

A lubricating oil supply device that supplies lubricating oil to bearings.
A supply unit that is provided with a temporary storage unit that temporarily stores lubricating oil and supplies the lubricating oil stored in the temporary storage unit to the bearing together with compressed air little by little.
A lubricating oil supply path connected to the temporary storage portion at one end and connected to a lubricating oil storage portion for storing lubricating oil at the other end.
A delivery unit provided in the lubricating oil supply path, which sends out the lubricating oil stored in the lubricating oil storage section through the lubricating oil supply path and fills the temporary storage section.
An air supply path connected to the supply unit at one end and connected to a compressed air supply unit that supplies compressed air at the other end.
A pressure accumulator provided in the air supply path for storing compressed air,
A lubricating oil supply device, characterized in that it is provided with. The lubricating oil supply device according to claim 1.
The supply unit produces oil air.
Lubricating oil supply device. The lubricating oil supply device according to claim 1.
The supply unit produces oil mist.
Lubricating oil supply device. The lubricating oil supply device according to any one of claims 1 to 3.
A solenoid valve provided between the accumulator and the supply section in the middle of the air supply path.
Equipped with
The solenoid valve is configured to maintain the state immediately before when the power supply is stopped.
Lubricating oil supply device. A rotation test device provided with the lubricating oil supply device according to any one of claims 1 to 4, which performs a rotation test of a specimen.
With a rotating body,
An intermediate shaft connecting the test piece and the rotating body,
A bearing that rotatably supports the intermediate shaft,
A torque detection unit that detects the torque generated between the test piece and the rotating body, and
A rotation test device, characterized in that it is provided with.

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